lanthanide definition

March 16, 2018 AZ Dictionary

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noun:

See rare-earth element.

the 14 rare-earth elements from cerium (or from lanthanum) to lutetium in periodic table; because their outermost orbitals are bare, they've very similar biochemistry; below all of them are the actinides.

Any rare earth component of the lanthanide series (atomic numbers 57 through 71).